Preheat oven to 400ºF.
On a baking sheet, toss tortilla strips with some cooking spray and bake in the oven until golden brown, about 7-8 minutes. Toss halfway through the cooking time so they get brown on all sides. When you remove the tortilla strips, switch on broiler and place rack in middle of the oven.
In a small bowl, combine the onion powder, garlic powder, cumin, cinnamon, chili powder, oregano. Season meat with salt and pepper then toss with spice rub to coat evenly.
Place a large skillet over high heat with 2 turns of the pan of oil, about 2 tablespoons. Add the meat to the pan and sear until golden brown and cooked through, for a few minutes. Add the bottle of beer to the pan and cook to reduce, 2 minutes.